Read the inspiring books and articles on Law of Attraction. You may want to invest on books like 

'The Secret", " The Power" " Power of Subconscious Mind" etc.

You can even read articles from my blog if you like, there are articles like power of chanting Om mAntra. How does it affect brain and help to calm down.

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 I would suggest you to read it specially before going to bed, because negativity and negative thoughts pattern often tend to come after we go to bed.So,if you make a habit to fuel your brain with positive resources you will be thinking positive thing while sleeping as well.

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